Table 1.
Baseline demographic and clinical characteristics by study centre. Values are numbers (percentages) unless stated otherwise
| Characteristics | Johns Hopkins (n=36) | Walter Reed (n=20) | Landstuhl (n=9) | P value |
|---|---|---|---|---|
| Mean (SD, range) age (years) | 57.9 (12.6, 30-85) | 59.1 (11.9, 34-79) | 35.4 (10.5, 21-53) | <0.0001 |
| Female sex | 32 (89) | 19 (95) | 5 (56) | 0.02 |
| Obesity | 8 (22) | 8 (40) | 1 (11) | 0.21 |
| Mean (SD, range) duration of pain (years) | 4.1 (4.2, 0.1-16) | 3.1 (2.4, 0.1-7.5) | 4.8 (3.5, 0.3-10) | 0.49 |
| Opioid use | 15 (42) | 5 (25) | 2 (22) | 0.41 |
| Mean (SD, range) Oswestry disability index score | 43.3 (13.1, 18-67) | 36.8 (14.9, 14-62) | 37.2 (12.5, 20-54) | 0.18 |
| Mean (SD, range) pain intensity at rest* | 5.5 (5.0, 1-10) | 4.2 (2.4, 1-9) | 3.6 (1.2, 2-6) | 0.06 |
| Mean (SD, range) pain intensity with activity* | 8.0 (1.9, 3-10) | 7.1 (2.3, 2-10) | 6.4 (1.4, 3.5-8) | 0.07 |
| Success: | (n=35) | (n=20) | (n=9) | 0.49 |
| None | 11 (31) | 11 (55) | 3 (33) | |
| At 1 month only | 7 (20) | 3 (15) | 1 (11) | |
| At 3 months | 17 (49) | 6 (30) | 5 (56) |
*Numerical rating pain scale.